A TV anime produced by Aniplex and based on the popular Nitro yaoi visual novel.

After World War Three (also known as the Third
Division) Japan is split into two. Not long after the war and the
division, a crime monopoly 'Vischio' takes over former Tokyo, which is
called 'Toshima'. In this dystopian future Japan, a game called 'Igura'
is formed and the murderous bloodbath commences.

The game of Igura involves the killing of other participants in order to
obtain dog tags. 'Igura' is modelled after a game of poker. Each
participant is given five dog tags. Each dog tag is modelled after a
card from a standard deck of playing cards. In order to get

The
dog tags used in Igura

these dog tags, participants must go see the crime lord Arbitro, and
tell them their reason for participating. When the participants begin
the game, they must visibly wear at least one dog tag. The object of the
game is to collect a Royal Flush (as in the standard poker hand) by
winning battles against other players. A battle between another player
is over once one of the fighters dies, or if their back touches the
ground. At that point, the winner may take the looser's tags, and do
what they want
with the looser, usually resulting in death. Once a player successfully
gets a Royal Flush, they have the opportunity to challenge 'Il Re'.

The Anime

Akira, a young boy who previously fought in a
street fighting game called 'Bl@ster' under the name Lost, is framed
for a crime, and sent to jail. But soon later, a mysterious woman comes
and grants him freedom, but only if Akira agrees to play in Igura and
defeat Il Re, the king of Igura. The story follows Akira and his
experiences in Toshima, and his trials playing Igura.